Experimental study of electromagnetic wave scattering from a gyrotropic gaseous plasma column

Houriez, Luc; Bernety, Hossein Mehrpour; Rodríguez, Jesse A.; Wang, Benjamin; Cappelli, Mark A.

doi:10.1063/5.0095038

Cited by 9 publications

(2 citation statements)

References 19 publications

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“…6). The order of magnitude of the estimated plasma density is in good agreement with other estimates [29]. Since the lamp used in this study has higher r.m.s current and similar radius, our estimation is reasonably higher than the values in the reference.…”

Section: Resultssupporting

confidence: 89%

“…UV light at 253.7 nm is emitted when the atoms are de-excited [28]. The lamp is powered by a variable transformer that is adjustable from 0 to 148 V. An AC ballast operating at 33.1 kHz [29] is connected in series to regulate the power drawn by the negative resistance of the lamp. In laboratory settings, a glow discharge can usually sustain a plasma with electron density of 10 10 ∼ 10 12 cm −3 , corresponding to plasma frequencies of f p = ω p /2π = 1 ∼ 9 GHz [30].…”

Section: Component Modelmentioning

confidence: 99%

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Electromagnetic Nonreciprocity in a Magnetized Plasma Circulator

Li¹,

Davis²,

Kandil³

et al. 2022

Preprint

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Nonreciprocal transport of electromagnetic waves within magnetized plasma is a powerful building block towards understanding and exploiting the properties of more general topological systems. Much recent attention has been paid to the theoretical issues of wave interaction within such a medium, but there is a lack of experimental verification that such systems can be viable in a lab or industrial setting. This work provides an experimental proof-of-concept by demonstrating nonreciprocity in a unit component, a microwave plasma circulator. We design an E-plane Y junction plasma circulator operating in the range of 4 to 6 GHz using standardized waveguide specifications. From both simulations and experiments, we observe wide band isolation for the power transmission through the circulator. The performance and the frequency band of the circulator can be easily tuned by changing the plasma density and the magnetic field strength. By linking simulations and experimental results, we estimate the plasma density for the device.

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Section: Resultssupporting

confidence: 89%

Section: Component Modelmentioning

confidence: 99%

Electromagnetic Nonreciprocity in a Magnetized Plasma Circulator

Li¹,

Davis²,

Kandil³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

A tunable microwave circulator based on a magnetized plasma as an active gyrotropic element

et al. 2022

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We present a theoretical analysis and experimental demonstration of a microwave circulator that uses a magnetized plasma as the gyrotropic element. Unlike traditional circulators that exploit the anisotropic permeability of ferrite, here, we exploit the anisotropic dielectric constant of a magnetized plasma to achieve non-reciprocity. The advantage of a plasma-loaded circulator is that it allows for tunability, and modulation that is limited in speed by the ionization/recombination time of the plasma. The theoretical analysis treats the problem of electromagnetic scattering from a heterogeneous gyrotropic plasma rod to confirm scattering behavior and to guide in defining the design parameter space covered by more detailed computational simulations. Proof-of-concept experiments are carried out using a custom-fabricated low-frequency gas discharge tube as the plasma element. Here, we confirm the plasma-frequency dependent tunability predicted by the simulations, demonstrating this tunability in the experiments by varying the applied discharge voltage. These initial experiments suggest that isolation in excess of 25 dB is achievable, in reasonable agreement with the theory and simulations for studies in the S and C ranges of the microwave spectrum.

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A characterization of plasma properties of a heterogeneous magnetized low pressure discharge column

et al. 2022

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An approach is presented for characterizing heterogeneous magnetized plasma discharge tubes through the scattering of electromagnetic plane waves. Here, we formulate the analytical problem of electromagnetic scattering from a gyrotropic plasma column. The scattering accounts for the heterogeneous composition of the cylindrical discharge plasma and facilitates determining its propensity for gyrotropic scattering, particularly when electron collisional damping may be prevalent. The analytical results are validated using computational simulations. Scattered fields from the magnetized plasma are measured experimentally, and, by comparing the analytical and experimental results, the unknown parameters of the discharge, i.e., characteristic plasma and electron collisional damping frequencies, are determined. The technique is relatively straight-forward to use and removes the need for commercial computational electromagnetic simulations when experimental data on scattering characteristics of such cylindrical discharge plasmas are available.

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Experimental study of electromagnetic wave scattering from a gyrotropic gaseous plasma column

Cited by 9 publications

References 19 publications

Electromagnetic Nonreciprocity in a Magnetized Plasma Circulator

Electromagnetic Nonreciprocity in a Magnetized Plasma Circulator

A tunable microwave circulator based on a magnetized plasma as an active gyrotropic element

A characterization of plasma properties of a heterogeneous magnetized low pressure discharge column

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